Safety lock



atentedl July 5, 1949 STATES PATENT OFFICE 3 Claims.

This invention relates to improvements in safety locks for windows.

An object of the invention is to provide an improved safety lock. forwindows which will be positive in action when securing the windowagainst movement, and will provide a resilient tensioning means betweenthe window sash and the frame whereby he sash may be raised to anydesired height and supported at the selected adjustment.

A further object of the invention is to provide an improved safety loci:for window sashes which will include a housing mounted transversely uponthe upper sash rail and will include a horizontally slidable locking pinwhich will be spring projected to engage an undulating track secured tothe side of the window frame for holding the window in the desiredadjusted open position, and a pivoted locking element adapted to bemoved into locking position behind said pin when it is desired to securethe window against vertical movement in either direction.

A still further object of the invention is to provide an improved safetylock for windows which will be highly efficient in operation, andrelatively inexpensive to manufacture and produce.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application,

Figure 1 is a front elevation of the improved safety loelc shown appliedto a window sash and with the undulating locking strip shown secured tothe adj acent base of the window frame;

Figure 2 is an edge view of the undulating locking strip;

Figure 3 is a front elevation of a portion of the undulating lockingstrip;

Figure 4 is a longitudinal sectional view taken through the improvedsafety lock showing the same in locked position, and showing the same indotted lines with the locking catch in released position;

Figure 5 is a sectional view taken on the line 5-5 of Figure 4;

Figure 6 is a sectional view taken on the line 65 of Figure 4, and

Figure 7 is a sectional view taken on the line l-l of Figure 4.

Like characters of reference are used throughout the followingspecification and the accompanying drawings to designate correspondingparts.

In carrying out the invention, there is illustrated a window sashgenerally denoted by the reference numeral I, and a window frame 2therefor.

A metal undulating locking strip 3 is securely fastened to the insideedge of the window frame2 by means of the short screws 4. in position tobe engaged by the improved safety lock. hereinafter 1ore fullydescribed.

The safety lock is adapted to be secured upon the upper surface, of thewindow sash I, and comprises an elongated substantially rectangularshaped lock housing 5 formed by an upper plate 6 and a lower plate I,together with the. oppositely disposed side plates 8 and 9;

The oppositely disposed inwardly directed apertured ears Ill and II areformed integrally upon the opposite side plates 8- and 9 respectively,said apertures being threaded to. receive the screws I2 which extendthrough threaded apertures formed through the upper plateB andthroughthe lower plate 7, thereby, supporting the upper and lower plate and thecooperating side plates in fixed position to provide ahollow elongated;rectangular shaped housing.

A pair of spacedinverted U-shaped bearing ribs I3 are welded to theupper plate 6, while a pair of spaced U-shaped bearing ribs. I4 arewelded to the upper surface of the lower plate 1 directly below saidribs I3, forming guide channels for the elongated locking bolt I 5,which is rectangular in cross section, and is reduced atits forward endto provide the finger l6.

Front and rear closure members I! and I8 respectively are secured in thefront and rear ends of the lock housing 5, and the front closure memberI! is centrally apertured to permit the forwardly extending cylindricallocking finger [6. to pass and slide therethrough; to engage theundulating locking, strip 3 secured to the adjacent side edge of thewindow frame 2. A stop lug I9 is formed integrally on the lower surfaceof the locking bolt I5, and is providedsothat it will engage theadjacent U-shaped bearing rib Has the locking bolt is forced. inwardlywithin the lock housing 5 to limit the inward movement thereof.

A. stud 20 isfixed to the inner surface of the rear closure member I8and supports one end of a substantially heavy coil spring 2|, whoseforward end is received within a bore 22 formed in the rear end of thesaid locking bolt I5, serving to normally and resiliently urge the saidlocking bolt I5 to its outermost position and into engagement with themetal undulating strip 3.

A bearing roller 23 is provided with reduced opposite ends 24' and 25,and is mounted transversel between the opposite side plates 8 and 9 ofthe lock housing 5, as clearly illustrated in Figure 5 of the drawings.A locking plate or member 26 is secured to the bearing roller 23 and ismovable therewith, and supports the upwardly extending operating finger21 which extends upwardly from the roller out through the longitudinalslot 28 formed through the rear end of the upper plate 6, whereby thelocking plate or member 26 will be disposed behind the locking ear 29formed integrally on the upper end of the locking bolt [5 and at therear end thereof, thereby providing an absolute and positive lock forpreventing the inward movement of the locking bolt for holding the samein positive contact with the undulating strip 3 secured to the insidesurface of the window frame 2, thus preventing the window sash frombeing either raised or lowered.

When the operating finger 2'! is moved rearwardly, the lockin plate ormember 26 will be disengaged from behind the locking ear 29 on thelocking bolt IE to release the bolt so that it will be free to slidebackwardly and forwardly within the bearing ribs in said lock housing 5,for permitting the window sash to be raised or lowered if desired.

A pair of spaced downwardly extending lugs 38 are suitably secured tothe undersurface of the upper plate 6 at the rear end thereof, andsupports the leaf spring 31 therebetween, said spring being boweddownwardly to engage and rest on the upper surface of the bearing roller23 to tension the operation of the same.

The lower plate I of the lock housing 5 will extend downwardly in thefront end of said housing and at right angles thereto, being formedintegrally therewith, and being provided with the apertures 33, throughwhich securing screws (not shown) may be placed for locking the lockhousing 5 in fixed position upon the top edge of the upper rail of thewindow sash I.

From th foregoing description, it will be seen that the operation of theimproved safety lock for sashes will be as follows: The operating finger21 will be moved to the left, as viewed in Figure 6 of the drawings torelease the locking bolt l5 so that the window sash I may be raised orlowered as desired, and when the window sash is to be locked in anyposition either part way up, or fully down, the operating finger 2'!will be moved to a vertical position as shown in full lines in Figure 4,thereby moving the locking plate or member 26 behind the locking ear 29formed on the locking bolt I5 to secure the same against movement and inlocked position firmly and securely against the metal undulating strip 3secured to the sash frame 2.

While the preferred embodiment of the instant invention has beenillustrated and described, it will be understood that it is not intendedto limit the scope of the invention thereto, as many minor changes indetail of construction may be resorted to without departure from thespirit of the invention.

Having thus described my invention what I 4 claim as new and desire tosecure by Letters Patent of the United States is:

1. A sash fastener comprising an elongated casing adapted to be securedupon a window sash, oppositely disposed U-shaped bearing ribs on theinner surface of the top and bottom of the casing, a locking boltslidably mounted in said ribs, a reduced locking finger on on end of thebolt, a central bore in the opposite end of the bolt, resilient meansseated in said bore and abutting against one end of the casing forbiasing said locking finger forwardly of the casing, a locking earoffset upwardly from the inner end of the bolt, a roller transverselyjournaled in the casing adjacent the inner end of the bolt, a lock-/ ingplate carried by said roller engageable with said locking ear forholding the bolt in a fixed position, a finger lever secured to saidroller and extending upwardly through the top of the casin for movingsaid locking plate into locking engagement with the ear and means fortensioning said locking plate.

2. The combination of claim 1, wherein said last-mentioned meansincludes a leaf spring secured to the under surface of the top of thecasing and seated on the roller.

3. A sash fastener comprising an elongated casing adapted to be securedupon a window sash, oppositely disposed U-shaped bearing ribs on theinner surfaces of the top and bottom of the casing, a locking boltslidably mounted in the bearing ribs, a reduced locking finger on oneend of the bolt, a central bore in the opposite end of the bolt, aprojecting stud on the adjacent end of the casing, a spring seated insaid bore and received on the stud for biasing said locking fingerforwardly of the casing, a stop lug depending from said bolt adjacentthe locking finger and adapted to engage one of of the U-shaped ribs forlimiting inward movement of the locking finger, a locking ear offsetverticall from the inner end of the bolt, a roller journaledtransversely in the casing adjacent the inner end of the bolt, a lockingplate fixed on the under surface of the roller, a finger lever securedto said roller and extending through the top of the easing for movingsaid locking plate into a horizontal position abutting the locking earand holding the locking finger in an extended position, and resilientmeans for tensioning said locking plate.

CONSTANTINE JUSZCZAK.

REFERENCES CITED The following referenlces are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 148,578 Scrivner Mar. 17, 1874185,769 Matson et al Dec. 26, 1876 266,799 Felsberg Oct. 31, 1882532,935 Woolery Jan. 22, 1895 892,970 Bagby July '7, 1908 1,439,418Hubbard Dec. 19, 1922

